…HttpClientInterface (fabpot)

This PR was merged into the 4.3-dev branch.

Discussion
----------

[HttpKernel] add RealHttpKernel: handle requests with HttpClientInterface

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

This commit is directly extracted from #30602 by @fabpot

Commits
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b579b02 [HttpKernel] add RealHttpKernel: handle requests with HttpClientInterface

…GE Kévin)

This PR was merged into the 4.3-dev branch.

Discussion
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[BrowserKit] Add support for HttpClient

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no <!-- don't forget to update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tests pass?   | yes    <!-- please add some, will be required by reviewers -->
| Fixed tickets | part of #30502
| License       | MIT
| Doc PR        | not yet

When combining the power of the new HttpClient component with the BrowserKit and Mime components, we can makes something really powerful... a full/better/awesome replacement for https://github.com/FriendsOfPHP/Goutte.

So, this PR is about integrating the HttpClient component with BrowserKit to give users a high-level interface to ease usages in the most common use cases.

Scraping websites can be done like this:

```php
use Symfony\Component\BrowserKit\HttpBrowser;
use Symfony\Component\HttpClient\HttpClient;

$client = HttpClient::create();
$browser = new HttpBrowser($client);

$browser->request('GET', 'https://example.com/');
$browser->clickLink('Log In');
$browser->submitForm('Sign In', ['username' => 'me', 'password' => 'pass']);
$browser->clickLink('Subscriptions')->filter('table tr:nth-child(2) td:nth-child(2)')->each(function ($node) {
    echo trim($node->text())."\n";
});
```

And voilà! Nice, isn't?

Want to add HTTP cache? Sure:

```php
use Symfony\Component\HttpKernel\HttpCache\Store;

$client = HttpClient::create();
$store = new Store(sys_get_temp_dir().'/http-cache-store');

$browser = new HttpBrowser($client, $store);

// ...
```

Want logging and debugging of HTTP Cache? Yep:

```php
use Psr\Log\AbstractLogger;

class EchoLogger extends AbstractLogger
{
    public function log($level, $message, array $context = [])
    {
        echo $message."\n";
    }
}

$browser = new HttpBrowser($client, $store, new EchoLogger());
```

The first time you run your code, you will get an output similar to:

```
Request: GET https://twig.symfony.com/
Response: 200 https://twig.symfony.com/
Cache: GET /: miss, store
Request: GET https://twig.symfony.com/doc/2.x/
Response: 200 https://twig.symfony.com/doc/2.x/
Cache: GET /doc/2.x/: miss, store
```

But then:

```
Cache: GET /: fresh
Cache: GET /doc/2.x/: fresh
```

Limit is the sky here as you get the full power of all the Symfony ecosystem.

Under the hood, these examples leverage HttpFoundation, HttpKernel (with HttpCache),
DomCrawler, BrowserKit, CssSelector, HttpClient, Mime, ...

Excited?

P.S. : Tests need to wait for the HttpClient Mock class to land into master.

Commits
-------

b5b2a25 Add tests for HttpBrowser
dd55845 [BrowserKit] added support for HttpClient

This PR was merged into the 4.3-dev branch.

Discussion
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[HttpClient] added CachingHttpClient

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

The proposed `CachingHttpClient` uses `HttpCache` from the HttpKernel component to provide an HTTP-compliant cache.

If this is accepted, it could replace the corresponding part in #30602

Commits
-------

dae5686 [HttpClient] added CachingHttpClient

This PR was merged into the 4.3 branch.

Discussion
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Replace references to Goutte with HttpBrowser

With the introduction of [HttpBrowser](symfony/symfony#30602) there's no need for Goutte any more, but the docs currently mention both, which is a little bit confusing. Also, the current version of Goutte actuality [extends HttpBrowser](https://github.com/FriendsOfPHP/Goutte/blob/v4.0.0/Goutte/Client.php), but doesn't add any functionality to it. It seems to me that Goutte is being completely replaced with HttpBrowser so there's no point in mentioning it in the docs any more.

Commits
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50898ae Replace references to Goutte with HttpBrowser